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Following the extinction of the GroupB rally cars, FIA introduced devices known as turbo restrictors in order to limit the maximum output of turbocharged engines. These are to be applied to all GroupA, WRC and GroupN vehicles taking part in FIA competitions. FIA explains the introduction of turbo restrictors with safety reasons. Like many other FIA decisions this an unfortunate one. Most rally drivers are complaining that the cars are less easy to drive with these devices fitted since the chassis handling capacity is under-exploited. Most of the negative effects of turbo restrictors are efficiently addressed by electronic engine management systems.
A restrictor plate or air restrictor is a device installed at the intake of an engine to limit its power. This kind of system is occasionally used in road vehicles (e.g., motorcycles) for insurance purposes, but mainly in automobile racing, to limit top speed and thus increase safety, to provide equal level of competition, and to lower costs; insurance purposes have also factored in for motorsports.